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The high street bank has issued the warning to its customers as it embarks on the huge process of changing hundreds of thousands of sort codes to line up with incoming Government legislation to 'ring-fence' off more risky banking practices.

A spokesman for Barclays said: “We’re changing the way we structure our organisation to make it simpler and prepare for ring-fencing requirements.

“During the periods where we’ll be carrying out work on our systems, some core services will be affected.

“However, we’ll always let you know about these periods in advance so you can organise your banking.

“We know this may cause disruption and we’re sorry for the inconvenience.”